湿度对偏振光传输特性影响的研究

Research of influence of humidity on transmission characteristics of polarized light

城市污染的日益增强导致大气环境中烟煤粒子含量不断上升,为了进一步研究烟煤环境下湿度对偏振光传输特性的影响,研究气溶胶粒子的半径及折射率等参数随湿度的改变情况,并采用蒙特卡洛的仿真方法,模拟不同入射偏振光在烟煤介质中的传输过程,得到出射光斯托克斯参量的仿真图样及偏振特性。结果表明:烟煤环境下相对湿度的变化对偏振特性有规律性的影响。随着相对湿度的增加,线偏振光入射时出射光的偏振特性逐渐增强,且能很好的保持自身的偏振态;圆偏振光入射时出射光的偏振度在相对湿度为85%时达到最大值,偏振度及偏振角波动较大且无明显规律。因此随着相对湿度的增加入射光为线偏振光时出射光在保持偏振态及偏振特性增强方面更具优势。

Growing urban pollution leads to the rise of the carbonaceous particle content in the atmospheric environment. To further research the influence of the humidity on transmission characteristics of polarized light, radius, refractive index and the other parameters of aerosol particles at different humidities were studied, and through Monte Carlo method the transmission process of different incident light in carbonaceous medium was simulated, which could get the Stocks simulation pattern and polarization characteristics of the emergent light. The results show that the change of increase of the relative humidity can influence the polarization characteristic regularly. With the increase of the relative humidity, when the incident light is linear polarization, the polarization characteristics of emergent lights will have a increasing tendency, and can keep their polarization states; When the incident light is circular polarization, the degree of polarization（DOP） of the emergent light will have a maximum value at the humidity of 85%, and there will be no obvious regularity in the fluctuation of DOP and polarization angle. Therefore, when the incident light is linearly polarized light, the emergent light has a more advantageous in the polarization state keeping and polarization characteristic enhancement with the increase of the relative humidity.